Grin ding-iv



'(No Model.)

. S. C. SGHOPIELD.

GRINDING MILL.l

ATTORNEY NL FETE-ns. Pholommgmmr, wnhi nnnnnnnn C.

Ntra STATES SILAS C. SCHOFIELD, OF FREEPORT, ILLINOIS.

GRlNDlNG-MILL.

SPECIFICATION forming part of Letters Patent No. 310,916, dated January 20,1885.

Application ficd January 14, 1884. (No model.)

To all whom it' may concern/.-

Be it known that I, SILAs C. ScHorinLn, a resident of Freeport, in the county of Stephenson and State of Illinois, haveinvented certain new and useful Improvements in Grinding- Mills; and I do hereby declare the following to ing in the direction indicated by the arrow a,

Fig. l) of the central portion of the cross-bar O and lug Q, which engages with it, the lug being cutA by a vertical plane passing through the line x 1', Fig. 3; Fig. 3, a central vertical section of the mill through the line x y, Fig. l, the meal-box being shown in elevation and partly broken away to show the mill; Fig. 4, a 4vertical crosssection (enlarged scale) showing the joint between the bed-plate T and rotating ring S; Fig. 5, a bottom plan showing the connection of the bed-plate T and the outer grinding-ring, L; and Fig. 6, an enlarged vertical section ofthe base-plate T, grinding-ring L, and the means by which they are connected.

In these views A is a preferably rectangular meal-box, having its ends gained into its sides, as shown, and its side pieces connected at the ends by cross-rods D D, each of which is provided at one end with an eye, d, and at the other end with a nut, d', by means of which the side pieces may bedrawn together. The eyes del are at diagonally-opposite corners of the box, and through them pass anchoring loops or rods C C, which are attached at their outer ends "to anchoring-stakes N N. The movable portion of the mill rotates in the direction indicated by the arrow a', Fig. l, and the resistance to torsional strain, which is ordinarily borne by the meal-box, is transferred to the cross-rods D, anchoring-rods C, and stakes N. The most advantageous position for the rods G is evidently in lines tangent to a circle concentric with the mill, and I do not therefore limit their application to the particular position in which they are shown. On the meal-box rests an annular base-plate, T, Fig. 3, provided with three integrallyformed ears, E, by means of which it is fastened to the box. The upper edge of the annular base-plate is provided with a groove, e, on both margins of which are beveled sur faces b b, inclined downward, and away from the edges of the groove. (See Figs. 3, 4.)

Within the base T is a grinding-ring, L', providedV with grindingzteeth on its inner face, and fastened to the base by means of a series of ears, c, extending outward from the lower edge of the grinding-ring, and a series of bolts, passing upward through said ears and through the base-plate T. By inserting washers of any desired thickness between the bottom of the baseplate T and the ears c the ring L may be placed at any desired height with reference to the base-plate, and, if necessary, washers of different thickness may loe placed on the different ears, for the purpose of throwing the grinding-ring into or out of level.

On the annular base-plate T rests a ring, S, whose lower edge rests ou and conforms to the upper edge of the basc-plate, the central portion of said lower edge being convex and resting in the groove c, hereinbefore referred to, while on the opposite sides of such convex portion are two downwardly-inclined lips, a a, which coincide with the inclined faces b Z) of the annular base-plate.v (See Fig. 4.) The result of this construction is the complete exclusion of dirt, meal, or any other foreign substance from the impinging surfaces of the ring S and base-plate T, and the consequent decrease of friction of those surfaces. The ring Sis provided with a series of integrally-formed converging arms rising from the ring to their point of intersection at the center of the mill, and through their intersection passes a vertical bolt, It, having at its lower end ahead which supports a cone, G. The upper end of the bolt is screw-threaded, and provided with a nut, I, by means of which the cone may be raised or lowered. The nut I is turned by means of a wrench, J, consisting of a handle or lever and a socket to receive the nut. The socket has vertical sides which conform to the shape of the nut, and an integrally-formed IOO bottom which lies under the nut, and has a central opening through which the bolt passes. rlhe wrench is thus held in place on the nut so long as the latter remains on the bolt, and is much more convenient than an ordinary detachable wrench.

To the outer edge of the cone G is rigidly attached a grinding-ring, L, provided with suitable grinding-teeth on its outer face, and adapted to coi-operate with the grinding-ring L already described. The suspension of the cone by a single bolt passing through its vcrteX allows it sufficient oscillatory motion for necessary adjustment to the grinding ring L, and prevents unequal grinding at different points in its periphery. On the upper surface of the cone, near its outer margin, are a series of lugs, K, Figs. 1 and 3, corresponding in number and arrangement to the arms H of the ring S, and on the lower side of each of the arms H, just inside of the ring S, is a downwardly-projecting lug, M, which is adapted to engage with one of the lugs K ofthe cone, so that rota-tion of the ring S and its arms H necessarily produces simultaneous rotation of the cone without affecting the oscillatory motion of the cone, which has been already referred to. The ring S is provided with two diametrically-opposite integrally-formed trunnions,V V, on which are pivoted two converging levers, B B, Fig. l, connected at their point of intersection, and held together by a crossbur, O, Figs. l and 3. At the center of the cross-bar is a gain or recess made by cutting away the lower half of that face of the crossbar neXt the mill, the recess being of sufficient length and breadth to receive a lug, Q, formed integrally with the ring S, and of sufficient height to allow considerable vertical movement ofthe cross-bar without striking the lug. A stirrup, I), crosses the recess in the plane of the lower l'ace of the cross-bar, its legs passing up through the cross-bar and being secured by nuts. The stirrup l? and the portion of the cross-bar above the recess form the limits of motion ofthe sweep. \Vithin these limits it moves freely up or down to accommodate itself to the inequalities of the ground or the varying motion ofthe horses, but movement above the prescribed limit is prevented by the stirrup, while movement below this is stopped by the striking of the cross-bar on the upper surface ot' the lug Q.

I am aware that it is not new to suspend a grinding-cone from a movable ring resting on the base-plate, the ring and cone being provided with such means of connection as to insure their simultaneous rotation. So far as I know, however, the connection between the ring and cone has been at the center instead of at the periphery, as shown and described in this patent. Since the sweeps are attached to the periphery of the moving ring, it is evident that when the connection of the ring and cone is at the center, the converging arms of the ring must be strong enough to transmit the power from the periphery to the center of the mill. There the connection is at the periphery, however, as shown in this application, the arms which support the cone have no torsional strain to withstand, and need only such strength as is sufficient to support the weight of the mill.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination of a sweep actuated grindingmi11,a meal-box supportingsaid mill, cross-rods binding together the opposite sides of said meal-box, and each provided at one end with means for attaching to it an anchoring-rod, anchoring-rods attached at one end to the ends of said cross-rods, respectively, and extending therefrom in a direction oppo` site to the direction of rotation of the sweeps, and anchoring-stak es securing the extremities of said anchoring-rods, substantially as shown and described, and for the purpose set forth.

2. In a grinding-mill, an annular base-plate, T, having its upper edge provided with a groove, e, and beveled faces b b on either side of said groove, in combination with a movable ring, S, whose lower edge is provided with a convex central portion conforming to the groove e, and two downwardly-inelined lips, a a', conforming to the beveled surfaces b b, substantially as shown and described, and for the purpose set forth.

3. The combination of the ring S, trunnions V, and lug Q, formed integrally therewith, sweep-levers B, pivcted on said trunnicns, cross-bar O, connecting said levers, and recessed, as described, for the reception ot' said lug, and stirrup I), extending across the bottom of said recess, substantially as shown and described, and for the purpose set forth.

4. The combination of the annular baseplate T, ring S, rotating thereon, integrallyformed converging arms H, provided with lugs M at their outer ends, cone G, suspended from said arms. lugs K on the upper surface of said cone, adapted to engage with the lugs M and insure simultaneous rotation of said ring and cone, and means for rotating said ring, substantially as shown and described, and for the purpose set forth.

SILAS C. SCHOFIELD.

Vitnesses:

VALLACE GREENE, A. V. RICHARD.

IOO 

